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hwm
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MATLAB, 18 bytes

This can be run as a script:

for j=1:2;j(j);end

The first iteration is fine, since j(1) is just 1. The second iteration crashes with an array out of bounds error, as j(2) exceeds the dimensions of j, which is a 1x1 array.

This also can be run as a script, but it only works the first time you run it. Still, it's a hilarious enough abuse of MATLAB's predefined constants that I thought I'd include it. It's also 18 bytes.

while i/i;i={};end

When run in a workspace that the variable i hasn't been defined in yet, this assumes i is the imaginary unit, so i/i = 1. In the first loop, the assignment i={} creates an empty cell array called i. On the second iteration, the loop exits with "Undefined operator '/' for input arguments of type 'cell'."

MATLAB, 18 bytes

This can be run as a script:

for j=1:2;j(j);end

The first iteration is fine, since j(1) is just 1. The second iteration crashes with an array out of bounds error, as j(2) exceeds the dimensions of j, which is a 1x1 array.

MATLAB, 18 bytes

This can be run as a script:

for j=1:2;j(j);end

The first iteration is fine, since j(1) is just 1. The second iteration crashes with an array out of bounds error, as j(2) exceeds the dimensions of j, which is a 1x1 array.

This also can be run as a script, but it only works the first time you run it. Still, it's a hilarious enough abuse of MATLAB's predefined constants that I thought I'd include it. It's also 18 bytes.

while i/i;i={};end

When run in a workspace that the variable i hasn't been defined in yet, this assumes i is the imaginary unit, so i/i = 1. In the first loop, the assignment i={} creates an empty cell array called i. On the second iteration, the loop exits with "Undefined operator '/' for input arguments of type 'cell'."

Source Link
hwm
hwm
  • 341
  • 1
  • 6

MATLAB, 18 bytes

This can be run as a script:

for j=1:2;j(j);end

The first iteration is fine, since j(1) is just 1. The second iteration crashes with an array out of bounds error, as j(2) exceeds the dimensions of j, which is a 1x1 array.